Kalamein door



y 9 w. w. Ma GRuDER KALAME IN DOOR Filed Jan. 11. 1928 3 Sheets-Sheet 2INVENTIOR July 22, 1930. I w 'w, MacGRUDER 1,771,304

KALAMEIN DOOR Filed Jan. 11, 1928 3 Sheets-Sheet 5 my invention;

Patented July 22, 1930 UNITED STATES Parr 'FFlCE I WILLIAM W. MACGRUDER,OF GREENSBURG, PENNSYLVANIA, ASSIGNOR TO W. F. 'OVERLY & SONS, OFGREENSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA Thisinventionis for an improvementin metal sheathed Wooden doors known in the tradeas kalamein doors.

Kalamein doors are widely used where pro- 1,- tection against fire isdesired, and in order to 1 meet the requirement imposed by insurancecompanies, theirconstruction must be such that the door willstand upafter the wooden core has been burned out.

The present invention has for its object to provide a door constructionwherein all of the wooden parts of the door are encased sheet metalandwherein the sheet metal casing is firmly held together.. A furtherobjectrof the invention is to provide a door of this kind which isconvenient and cheap to assemble and wherein the metal, sheathing I andthe wood can be cut to size and kept in stock separately and assembledas required.

at 'The invention may be readily understood by reference to theaccompanying drawings in which Figure l is a front elevation of a com-'plete "door constructed in I accordance with Figure 2' is a perspectiveview of the wooden parts of the door frame without the metal appliedthereto j j i Figure 3 is a transverse sectionthrough the door" shown inFigure 1 Figure 4 is an exploded View of the several parts ofthe door ina position to be fitted. together; r

Figure 5 is a detail view showing'the mane "se ner-in which thepanel issecured to the side frame; i

Figure dis an enlarged section in the of line VIVI of Figure 1; i AFigure 7 is a similar view in the 10- line; V IIVII of Figure 1;

Figure 8 is ad'etail sectional view on. a .largerscale' in the planeofline VIII VIII of Figure 1; i

FigureQ' is a corner of the; door at the bottom," the view plane planeof bottom corner of the door, thesection being a detail vertical sectionthrough Figure 10 isa vertical section through a;

KALAMEIN DOOR The wooden door frame, whichis shown in Figure 2, prior tothe application of the metal comprises vertical stiles 2. Thedverticalstiles are connected at the top by a top rail made of an upper piece 3and a lower piece 4. They are connectedat the bottom by a bottom "railcomprised ofan upper piece 5 and a lower piece 6. At 7 is a middle rail.In F igure 2, the wooden frame members are shown secured together,although they are actually in practice, not secured together until eachpiece has been individually encased in'metal, ashereinafter described.The upper part 5 of the bottom rail has a vertically extending slot 8therein ateach end thereof. The lower member 6 of the bottomrail has anopposed pair'of transverse slots 9 ateach end thereof, the slots9 beingformed in opposite sides of the piece 6. The members 3 and 4 of the toprail are slotted just the same way as the corresponding parts 6 and 5respectively of the bot-. tomrail. H f

Each vertical stile 2 is encased in a metal sheath 10. which conforms tothe shape thereof land which fits tightly thereover. The

edges of the sheet metal sheath are brought together along theverticalinner face of the.

stile, asindicated at 11 in Figure 4, the meet ing edges of the sheathbeing turned outwardlyto form a double fiange downthis face of,

the strip. The metal sheath has side flaps at the top and bottom thereofdesignated 12, which project beyond the end of the stile, as best shownin Figure 4, when the sheath'is first put on the metal. The sheath alsohas metal fittedtherearound, this casing being of the rail andturnedupwardly to form a double flange 16. The endsof the casing 15'are, turned over the ends of the member 5,

designated p The opposite edges; of the metal are brought together overthetop face being transverse to the plane of the door;

as shownat' 17 in Figures4 and 6. The p0r-- tions 1'? of the metal alsoproject into the slots 9 in the lower member 6, as best shown in Figure7.

The middle rail 7 is enclosed in two correspondingly shaped pieces ofsheet metal 18 and 19 with upturned edges 20 thereon forming doubleflanges along the top and bottom of the middle rail. The ends of thepieces 18 and 19 are bent over to cover the ends of the middle rail, thevertical slot 7 in the ends however, being left uncovered.

In assembling the door, the wooden part are first separately encased inmetal. The end rails at the top and bottom of the door are then fittedto the stiles, the inturned flanges 14 at the ends of the stiles beingreceived in the vertical slots 9 in the cross rails. The flange 11 onthe stiles enters the slot 8 in the cross rails at the same time themiddle rail is secured in place. One of the flanges 11 of one of thestiles enters a groove 7 at one end of the middle rail 7, and the flange11 of the other stile enters the corresponding groove 7 at the other endof the middle rail.

After the end rails have been placed on the stiles as described, a smallflanged metal plate 26 is placed over that portion of the Wooden railthat rests against the ends of the stile. The edges of the flanges 12and 13 are rolled over'to form an interlocking seam around the threeedges of the plate 26. The sheath 15 encasing the top and bottom railhas a flange 15 at each end thereof, and this flange is rolled over andinterlocked with the flange at one end of the plate 26 to form therolled joint 26 of Figure 10. The plate 26 not only serves to protectthe wooden structure at the door together. After the panels are securedin place, metal mold1ng28 1s placed around The door isfastened togetherand the sheathends of the stiles, but'also forms a metallic interlockbetween the end rails and the stiles. This interlock is sufficient tohold the door together even if the wooden core were en tirely removed.

'After the several parts have been placedtogether, the panels 21 and 22can be secured and spotwelding the panel to the upstanding flanges 11,16and 20. The spotwelding of the panel further ties the several parts ofthe the edges of the panels on each side of the door. v

The construction of the door is such that each piece can be separatelycovered with metal and then the several pieces assembled;

After the door has been assembled, all of the wooden parts arecompletely encased 1n metal, andthe frame is rigidly secured together.

ing secured t'o'the several members in suchway thatno nails or screwsnecessary for holdingthe door together, pass through the ,metalintothewood. Due to'this fact, the

.will. be understood that door will remain rigid even if the Wooden coreis burned out. The entire door is assembled with a minimum of parts, andthe various parts are so shaped that dies for bending the metal can beeasily provided. The entire construction lends itself to cheap, as wellas durable manufacture.

While I have particularly shown and described one embodiment of myinvention, it various detail changes and modifications may be madetherein. a

I claim:

1. In a kalamein door, top and bottom rails, each of which has a metalsheathing and projecting end portions, vertical'stiles, each of which isenclosed in a sheathing, said rails being equal to the distance betweenthe stiles, the projecting portions having a length equal to the widthof the stiles, the sheathing for the vertical stiles projecting beyondthe ends of the stiles and embracing'the projecting ends of the top andbottom rails, said projecting ends of the rails having transverse slotson opposite sides thereof to receive the sheathing of the stiles.

2. In a kalamein door, top and bottom rails, each of said rails having ametallic sheathing thereover and having projecting portions ateach endthereof, vertical stiles, each of said stiles having a metallicsheathing encasing the same, the metallic sheathing being longer thanthe stiles and projecting beyond each end of the stiles, the projectingpart of the sheathing for the stiles at each corner embracing one ofsaid projecting por tions of a top or bottom rail, thesheathing of thestile and the sheathing for the top or bottom rail being connectedtogether across the outside of the top and the bottom of the door andbeing in contact along the end faces of the rails and the inside facesof the stiles.

3. In a kalamein door, top and bottom rails,

each of which is enclosed in a metal sheathin which is foldedtransversely over the end facesthereof to substantially cover the endfaces, each rail having a projecting portion at each end thereof, a pairof vertical stiles, a sheathing enclosing each stile and projectingbeyond the end of the stile at each end thereof, said projecting.portions of the rails lying against the adjacent end of a stile, saidproj jecting portions of the rails being transversely slotted to receivea portion of the stile sheathing and into which the sheathing which isfolded over the end faces of the rails projects.

4. In a kalamein door, top and bottom rails, each-of which is enclosedin a metal sheatha ainst the adacent end of a stile said erob n i I 1ecting portions of the rails being transversely slotted to receive aportion of the stile sheathing, and a plate placed over each of saidprojecting portions and connected With the sheathing for the stileandwith the sheathing for the rail.

5. In a kalamein door, top and bottom having a projecting end portion ateach end thereof, said sheathing being folded over the end faces of therail but leaving the projecting end portions exposed, a vertical stileat each side of the door, each vertical stile having a metallicsheathing there'about whose edges are brought together to form a flangealong the inner face'of each stile, the end faces of the rails beinggrooved to receive the flanges of the stiles, the sheathing for eachstile projecting beyond the end of the stile at each end thereof andembracing the adjacent projecting portion of atop or bottom rail.

6. In a kalamein door, top and bottom rails, each of said rails having ametallic sheathing bent'thereabout with the edges of the sheathingbrought together to form a flange along the inside of the rail, eachrail having a projecting end portion at each end thereof, a verticalstile at each. side of the door, each vertical stile having a metallicsheathing thereabout whose edges are brought together to form a flangealong'the inner face of each stile, the sheathing for each stileprojecting beyond the end of the stile at each end thereof and embracingthe adjacent projecting portion of a top or bottom rail, each of saidrails having a vertical groove in anend face thereof adapted to receivethe flange of the stile sheathing.

7. In a kalamein door, top and bottom rails, each of'said rails having ametallic sheathing bent thereabout with the edges of the sheathingbrought together to form a flange alongthe inside of the rail, each railhaving a pro ecting end portion at each end thereof, a vertical stile ateach side of the door, each vertical stile having a metallic sheathingthereabout Whose edges v are brought together to form a flange alongthe"inner face of each stile, the sheathing for each stile'projectingbeyondthe end of the stile at each end thereof and embracing theadjacent projecting portion of a top or bottom'rail, each of said railshaving a vertical groove in an end face thereof adapted to receive theflange of the stile sheathing, said door also having amiddle rail havinga slot at each end thereof into which a flange of the stile sheathing isentered, saidmiddlei rail being enclosed in metallic sheathing formedoftwo pieces, the meetingedges of each stile projecting beyond the end ofthe stile at each end thereof and embracing the adjacent projectingportion of a top or bottom rail, each of said rails having a verticalgroove in an end face thereof adapted to receive the flange of the stilesheathing, said door also having a middle rail having a slot at each endthereof into which a flange of the stile sheathing is entered, saidmiddle rail being enclosed in metallic sheathing formed of two pieces,the meeting edges of which form flanges along the top and bottom edgesof'the rail, and panels in the door spotwelded to the respective flangesof the several members.

9. A kalamein door having vertical stiles at each side thereof and arail at each end 9 and being connected with the sheathing for i therail. a 10. In a kalamein door, an end rail comprising a short portionand a long portion,

a metal sheathing encasing the rail and leaving end sections of the longportion uncovered, said sheathing being bent around the ends of theshort'portion and being bent into transverse vertical slots in the longpor tion', the: edges of the sheathing being lbroughttogether over theinner'edge of the rail and forming a vertical flange therealong.

11. In a kalamein door, an end rail c'omprising a short portion and along portion, a metal sheathing encasing the rail and leaving endsectionsof the long portion uncovcred, said sheathing being bent aroundthe i ends of the short, portion and being'bent into transverse verticalslots in the long portion, 'the edges of the sheathing being broughttogetherover the inner edge of the rail and forming avertical flangetherealong," theends of the'short portion of the rail having verticalslots therein.

12. The method of forming a. kalainein door formed of several piecescomprising stiles and rails, which consists in placing a sheathing overthe individual pieces,

thereafter assembling the several pieces, and

then forming rigid oints' between the sheathing of the several pleces ofsuflicient strength to rigidly hold the door together. Intestimonywhereof I have hereunto set my hand.

WILLIAM MACGRUDER.

